---
id: CVE-2026-86440
title: >-
  Affected versions of MISP insufficiently validate URLs used by dashboard
  widgets, particularly the Button widget.



  The widget's URL is stored configuration controlled by a user
summary: >-
  Affected versions of MISP insufficiently validate URLs used by dashboard
  widgets, particularly the Button widget.



  The widget's URL is stored configuration controlled by a user. The previous
  renderer considered a URL safe if it appeared…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-20
  - CWE-79
vendor: misp-project
product: misp
affected:
  - misp <= 2.5.45
published: '2026-09-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T15:24:29.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86440'
references:
  - url: 'https://github.com/MISP/MISP/commit/adf704e94'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
epss: 0.00237
epssPercentile: 0.13122
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T14:51:27.052690Z'
scores:
  nvd: 5.4
  cna: 5.1
ingestedAt: '2026-09-08T15:33:26.977Z'
---

## Overview

Affected versions of MISP insufficiently validate URLs used by dashboard widgets, particularly the Button widget.


The widget's URL is stored configuration controlled by a user. The previous renderer considered a URL safe if it appeared relative or if its parsed hostname matched the configured MISP hostname. That logic failed to reject dangerous schemes and URL forms that browsers normalize differently from PHP's URL parsing.


As a result, values such as javascript: URLs or backslash-based authority forms could reach the generated anchor's href and execute script or navigate to an attacker-controlled origin when another user interacted with the widget. The upstream commit describes the issue as:


“javascript: and backslash URLs reached the href (stored XSS)”.


The fix routes widget URLs through a shared DashboardURLValidator, rejects dangerous schemes, raw backslashes, control characters, and unauthorized absolute origins, and validates the URL both in the widget handler and renderer.

Version affected: ≤2.5.45

## Affected

- `misp <= 2.5.45`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.